lauckekt



(No Model.) 3 Sheets-Sheet I,

E. F. H. H. LAUGKERT ELECTRIC METER.

No. 899,336. Pate' iMaJr. 1%, 1889.

if" w E (No Model.)

3 Sheets-S11eet 2. E. P. H. H. LAUOKERT.

ELECTRIC METER.

Patented Mar. 12, 1889.

Jay. 2,

(No Model.) 3 SheetsSheet 3 E. F. H. H. LAUCKERT.

ELECTRIC METER. No. 399,336. Patented Mar. 12, 1889.

I I I I I I I I I I I I I I I I l I I I I I 35%| l L swsww .IQIQ W p I g N. PC7555. Vhow-Lnho n r n Washing'an. D. c.

UNITED STATES PATENT OFFICE.

EDIVARD FREDERICK IIERMANN HEINRICH LAI'CKER'I, 01: CHARLTON, COUNTY OF KENT, ASSIGNOR TO SIEMENS BROTHERS & COMPANY, (LIMIIEI),) OF \VES".\IINSTI IR, EXGIIAN'I).

ELECTRIC METER.

SPECIFICATION forming part of Letters Patent No. 399,336, dated March 12, 1889.

Application filed October 5, 1888. Serial No. 287,344- (No model.) Patented in England December 21, 1887, No. 17,582, and in France September 26, 1888, No. 193,196.

ber 25, 1888, and for which a patent has been solicited in Great Britain, which patent, when granted, will be No. 17,582, and bear date December 21, 1887,) of which the following is a specification.

My invention relates to apparatus for indicating the time during which electricity is used for a lamp or a group of lamps, or for any I other purpose to which electricity is applied.

1 inner I is surrounded by a coil of insulated I provide for each lamp or consumer or each group of these a counter mechanism of any suitable known kind. plestform merely a graduated dial with an index. This counter or index is connected with It may be in its simclock-work by a magnetic clutch consisting of a pair of iron bosses facing each other, the one of them on an axle driven by the clockwork, the other on an axle belonging to the counter or index, either or both of these bosses being surrounded by a coil of wire forming part of the circuit of the lamp or other 0011- sumer of electricity, or being in a shunt from that circuit. lVhen acurrent passes through the coil, the two bosses are held together by magnetic attraction and the counter or index is driven by the clockwork, indicating and registering the time during which the current passes. \Vhen the current ceases, the clutch is released and the counter or index remains at rest, while the clock-work may continue to move.

Figure 1 of the accompanying drawings is a part longitudinal section. Fig. 2 is a trans verse section. Fig. 3 is a part plan, and Fig. 4 a diagram, of the arrangement of apparatus according to this invention for indicating the time during which electrical currents are used work.

in a number of circuits.

The apparatus shown is one applicable to twelve separate circuits, three pairs of indicators being arranged on each side of clockwork which occupies the middle of the casing; but, obviously, by varying the number of indicating parts the apparatus might be suited to a greater or less number of circuits.

In the middle of a closed casing is fixed a clock-work, C, which, by means of bevel-gear c (I, gives rotation to a spindle, A, that extends along the casing and has fixed on itanumber of worms, D. Each of these worms engages with a pair of wheels, E, one on each side of it, and thus a number of spindles carrying iron cylinders B are caused to revolve. At a little distance from the end of each of the cylinders B is an iron disk, B, which is fixed on the spindle of an index, P, and which is drawn away from B by a spring, Z. The cylwire, Y, within an iron box, R. This wire forms part of the circuit to which the indicator is applied, or of a shunt to that circuit, so that when an electrical current passes through the circuit the iron cylinder 13 becomes magnetized and attracts the iron disk B, thus forming a magnetic clutch, whereby the index P is caused to revolve along with the cylinder 3, and therefore at a definite rate as determined by the clock-work and the proportions of the connecting-gear. The spindle of the index P is geared to the spindle of a11- other index in the proportion of one to ten, or in any other desired proportion, and there may be several such indices indicating units,

tens, &c., of hours or other denominations of,

time, these indices showing on dials (seen through glasses in the cover) the time during which currents are maintained in the several circuits. As soon as the current in any oil cuit ceases, the cylinder 13 ceases to attract, and the disk B, being drawn away from B by the spring Z, the indices for that circuit stop.

Fig. at shows diagrammatically how several different circuits-such as those for glowlamps, arc-lamps, or. motorscan have their time-indicators worked by one set of clockl-Iaving thus described the nature of my illvention and the best means I know for can-y- In testimony lhave signed my name to this ing the same into practical effect, I claim specification in the presence of two subscrib- In apparatus for indicating the time during ing witnesses. ii 11 /-1?icitisu' d the m in ti n f C @190} 00 b a O EDWARD FREDERICK 5 clock-work, electromagnetic clutches driven 4 I ,1 H MAM. IIEENRICII LALCMERI. thereby, nuhces, and coils, through which a current of electricity passes during the time to be measured, exciting the electromagnetic ciutohes, and causing them to engage and move 10 the said indices, as and for the purposes described.

\Vitnesses:

ROLAND D. BLQOMFIELD,

5 VVG'f/QT'ZOO Place, S. l' V., Nolarys Clerk.

F. ALLCROFT HARDING,

5 W (LtETZOO Place, Surveyor. 

